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A meristem is the tissue in most plants containing undifferentiated cells (meristematic cells), found in zones of the plant where growth can take place. Meristematic cells give rise to various organs of the plant and keep the plant growing. The shoot apical meristem (SAM) gives rise to organs like the leaves and flowers, while the root apical meristem (RAM) provides the meristematic cells for the future root growth.
Apical meristem is found at the apices, or tips of the plant, both the tip of the shoot and the root and is a region of actively dividing cells. The definition of is easy to remember when you break it down.